信息安全课程设计

信息系统安全课程设计报告课题名称： OpenSSL 非对称加密

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指导教师姓名：

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提交报告时间： 2014年 6 月 10日

1.课程设计目标

了解OpenSSL非对称加密算法的背景知识，并实现加密解密。

2.分析与设计

（1）实现方法：

编程语言为C++语言。

编程方法：根据算法要求编写代码。

（2）利用OpenSSL命令制作生成密钥：

#include

#include

#include

#include

#include

int main()

{

char plain[256]="啦啦啦啦啦";

char encrypted[1024];

char decrypted[1024];

const char* pub_key="public.pem";

const char* priv_key="private.pem";

printf("%s\n",plain);

int len=strlen(plain);

BIO *pBio = BIO_new_file(pub_key,"r");

if(pBio==NULL){

printf("failed to open pub_key file %s!\n", pub_key);

return -1;

}

RSA* rsa1= PEM_read_bio_RSA_PUBKEY(pBio, NULL, NULL, NULL);

if(rsa1==NULL){

printf("unable to read public key!\n");

return -1;

}

BIO_free_all(pBio);

int outlen=RSA_public_encrypt(len, (unsigned char *)plain,(unsigned char *)encrypted, rsa1,RSA_PKCS1_PADDING);

printf("%d\n",outlen);

encrypted[outlen]='\0';

printf("%s\n",encrypted);

FILE* fp=fopen("out.txt","w");

fwrite(encrypted,1,outlen,fp);

fclose(fp);

pBio = BIO_new_file(priv_key,"r");

if(pBio==NULL){

printf("failed to open priv_key file %s!\n", pub_key);

return -1;

}

RSA *rsa2 = PEM_read_bio_RSAPrivateKey(pBio, NULL, NULL, NULL);

if(rsa2==NULL){

printf("unable to read private key!\n");

return -1;

}

BIO_free_all(pBio);

outlen=RSA_private_decrypt(outlen,(unsigned char *)encrypted,(unsigned char *)decrypted, rsa2,RSA_PKCS1_PADDING);

decrypted[outlen]='\0';

printf("%s\n",decrypted);

return 0;

}

（3）手动产生公钥：

#include

#include

#include

#include

#include

int main()

{

char plain[256]="rtre";

char encrypted[1024];

char decrypted[1024];

const char* pub_key="public2.pem";

const char* priv_key="private2.pem";

const int g_nBits = 1024;

printf("%s\n",plain);

int len=strlen(plain);

RSA *rsa1 = RSA_generate_key(g_nBits,RSA_F4,NULL,NULL);

if (rsa1 == NULL)

{

printf("rsa_generate_key error\n");

return -1;

}

BIO *pBio = BIO_new_file(pub_key,"w");

if (pBio == NULL)

{

printf("BIO_new_file %s error\n", pub_key);

return -1;

}

PEM_write_bio_RSAPublicKey(pBio,rsa1);

BIO_free_all(pBio);

int outlen=RSA_public_encrypt(len, (unsigned char *)plain,(unsigned char *)encrypted, rsa1,RSA_PKCS1_PADDING);

printf("%d\n",outlen);

encrypted[outlen]='\0';

printf("%s\n",encrypted);

FILE* fp=fopen("out.txt","w");

fwrite(encrypted,1,outlen,fp);

fclose(fp);

pBio = BIO_new_file(priv_key,"w");

if (pBio == NULL)

{

printf("BIO_new_file %s error\n", priv_key);

return -1;

}